(Table A1) Annual biomass of plants and animals recorded on Bylot Island betw...

Determining the manner in which food webs will respond to environmental changes is difficult because the relative importance of top-down vs. bottom-up forces in controlling...探明食物网（food web）对环境变化的响应模式极具挑战性，这是因为在调控相关过程中，下行控制（top-down）与上行控制（bottom-up）作用力的相对重要性……